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Jan 27, 2011 at 3:33 comment added Tim Perutz You're welcome. I don't think it's a dumb question - if I did, I wouldn't have bothered to answer!
Jan 26, 2011 at 23:28 comment added Xuanting Cai I am a knot theory student. Try to learn some 4 manifold thing. So maybe this is a dummy question for expert. Thank you.
Jan 26, 2011 at 23:06 vote accept Xuanting Cai
Jan 26, 2011 at 14:10 history answered Tim Perutz CC BY-SA 2.5